3.Rent schedule available, as well as lease and income reported to the IRS4.Not sure by what you mean doing it through the city, are referring to rehab permits?  

Lancaster city limits short term rentals to only certain zones of the city so definitely look at the city website for that information.

Furthermore, @Dave Meyer has a YouTube show/podcast on market trends for your reference.

You go to their website, enter all the details of your deal(you have to have the deal under contract and it CANNOT be listed with an agent in the MLS), and someone will contact you in a day or two to ask you some questions.

It has had higher appreciation than nearby towns since the pandemic and you should be cash flow neutral or slightly positive day one as a long-term rental with a 20% downpayment.Note that zillow and other websites greatly understate your property taxes. 

Everything you learn from books, podcasts, seminars, and websites is general information.

By insurability I'm referring to the problem created for title insurers evaluating what has transpired and whether they will issue a policy on the next transaction.

Thank you.While I am lending exact direction, you will need to dig a bit more on the statutes, to gain full comprehension of the statutes in reference your question.     

Do you check Landlord references?

@Polat CaglayanI've never seen a formula but here is a general rule of thumb for multifamily:The class of an apartment refers to the quality of the building, which can be determined by a number of factors, including age, location, and condition: Class A: These are the highest quality apartments, typically built within the last 15 years.